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M4 Corridor around Newport

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This consultation sought your views on the draft Plan to solve transport related problems affecting the M4 Corridor around Newport.
Tell us if you want any of the documents on this page in an alternative format.
Usk river bridge

We are planning to build a new section of motorway south of Newport alongside complementary measures.


Project status: planned
Region/county: south east
Start date: spring 2018
End date: autumn 2022
Cost: approximately £1bn
Design Development Team: Costain, Vinci and Taylor Woodrow with consultants Arup and Atkins, supported by environmental consultants RPS.

If we proceed with this project, we will register it with the Considerate Constructors Scheme (external link).


Why we are doing it

Our proposal for a new section of motorway, and complementary measures, is considered to be the sustainable, long-term solution to current social, environmental and economic problems associated with this route. It forms an essential part of our vision for an efficient integrated transport system in South Wales.

It will improve accessibility for people as well as Welsh goods and services to international markets.  

Current progress

We published draft Orders, an environmental statement, and other associated reporting in March 2016. You can find what these mean and view them here.

The Orders were published in draft to provide the opportunity for you or your organisation to object, support, or suggest alternatives. The period to make comments ended 4 May 2016.

On 5 September 2016 we published supplementary draft Orders to incorporate some minor changes to the project, which are available here. We also published a supplement to the environmental statement on the changes. 

On 14 December 2016 we published revised traffic and economic reports as a result of our review of new Department for Transport traffic growth forecasts. We also published a further supplementary draft Order to slightly increase the height of the River Usk Bridge and a further supplement to the environmental statement. We also published a fresh appraisal of the ability of public transport improvements to address the problems associated with the M4 and also the objectors’ suggested alternative known as the ‘Blue Route’. All of these publications are available here.


Pre-inquiry meeting: 27 January 2017
Public Local Inquiry: 28 February 2017

Following the Inquiry, should the decision be made to proceed to construction, the timetable could be as follows:

Start of construction: Spring 2018
Completion of new section of motorway: Autumn 2021
Completion of reclassification of existing motorway: Autumn 2022

Next steps

A Public Inquiry into the project is planned to start on 28 February 2017 and is expected to last around 5 months.

You will be able to view evidence presented to the inquiry on Persona Associates' website (external link).

You can contact Brian Greaves using our contact form.

Why hold a public local inquiry?

At a public local inquiry an independent inspector examines the social, environmental and economic issues and hears evidence from technical specialists, supporters and objectors. The inspector will consider the proposed solution and all suggested alternatives and report on the findings. This will inform the final decision on whether to go ahead with constructuion.